Fagor alarm 4073: ERROR 300: Heatsink of the power supply module overheated
CNC 8055 SERCOS drive error (DDS) · Fagor DDS drives
What it means
The shared power supply module (PS/XPS or compact-module supply section) reported its heatsink over temperature. The affected axes group stops; the CNC removes enables and aborts all programs. Stop the system several minutes, clean/verify the PSU cooling, and reduce regenerated/demanded power.
Likely causes
- Power-supply cooling fan failure
- Blocked PSU ventilation or oil-mist fouling
- Sustained regeneration or consumption near PSU rating
- High ambient cabinet temperature
Replacement parts
We supply the following units for this alarm — tested, warranty-backed:
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PS / XPS power supply
power-supply · Common cause
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Power supply cooling fan
fan · Common cause
Need the part urgently?
Send us alarm 4073 with your machine details — typical RFQ turnaround is 24–48h.